- 您现在的位置：买卖IC网 > PDF目录20781 > MAX16807AUI+ (Maxim Integrated)IC LED DRVR WT/RGB BCKLT 28TSSOP PDF资料下载
参数资料
| 型号： | MAX16807AUI+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 13/19页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WT/RGB BCKLT 28TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 恒定电流： | 是 |
| 拓扑： | 开路漏极，PWM，降压（降压），SEPIC，升压（升压） |
| 输出数： | 8 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 20kHz ~ 1MHz |
| 电源电压： | 8 V ~ 26.5 V |
| 输出电压： | 36V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
| 产品目录页面： | 1424 (CN2011-ZH PDF) |
Integrated 8-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
V+
pMOS typically 3.5 ? and the on-resistance of the
nMOS typically 4.5 ? . The driver can source 2A and
sink 1A typically. This allows for the MAX16807 to
quickly turn on and off high gate-charge MOSFETs.
Bypass V CC with one or more 0.1μF ceramic capacitors
1.23V
1.23
R EST
68W/L
W/L
995R
OUT_
to AGND, placed close to the V CC pin. The average
current sourced to drive the external MOSFET depends
on the total gate charge (Q G ) and operating frequency
of the converter. The power dissipation in the
MAX16807 is a function of the average output drive
current (I DRIVE ). Use the following equation to calculate
R
the power dissipation in the device due to I DRIVE :
I DRIVE = (Q G x f SW )
PD = (I DRIVE + I CC ) x V CC
SET
PGND
where I CC is the operating supply current. See the
Figure 1c. OUT_ Driver Internal Diagram
Switch-Mode Controller
Current-Mode Control Loop
The advantages of current-mode control over voltage-
mode control are twofold. First, there is the feed-for-
ward characteristic brought on by the controller’s ability
to adjust for variations in the input voltage on a cycle-
Typical Operating Characteristics for the operating
supply current at a given frequency.
Error Amplifier
The MAX16807 includes an internal error amplifier. The
inverting input is at FB and the noninverting input is
internally connected to a 2.5V reference. Set the output
voltage using a resistive divider between output of the
converter V OUT , FB, and AGND. Use the following for-
mula to set the output voltage:
V OUT = ? 1 +
? x V FB
by-cycle basis. Second, the stability requirements of
the current-mode controller are reduced to that of a sin-
gle pole system unlike the double pole in the voltage-
?
?
R 1 ?
R 2 ?
mode control scheme. The MAX16807 uses a
current-mode control loop where the output of the error
amplifier is compared to the current-sense voltage
(V CS ). When the current-sense signal is lower than the
inverting input of the CPWM comparator, the output of
the comparator is low and the switch is turned on at
each clock pulse. When the current-sense signal is
higher than the inverting input of the CPWM compara-
tor, the output is high and the switch is turned off.
Undervoltage Lockout (UVLO)
The turn-on supply voltage for the MAX16807 is 8.4V
(typ). Once V CC reaches 8.4V, the reference powers up.
There is a 0.8V of hysteresis from the turn-on voltage to
the UVLO threshold. Once V CC reaches 8.4V, the
MAX16807 operates with V CC down to 7.6V (typ). Once
V CC goes below 7.6V, the device is in UVLO. When in
UVLO, the quiescent supply current into V CC falls back
to 32μA (typ), and OUT and REF are pulled low.
MOSFET Driver
OUT drives an external n-channel MOSFET and swings
from AGND to V CC . Ensure that V CC remains below the
absolute maximum V GS rating of the external MOSFET.
OUT is a push-pull output with the on-resistance of the
where V FB = 2.5V.
Oscillator
The oscillator frequency is programmable using an
external capacitor and a resistor at RTCT (see R T and
C T in the Typical Operating Circuits). R T is connected
from RTCT to the 5V reference (REF), and C T is con-
nected from RTCT to AGND. REF charges C T through
R T until its voltage reaches 2.8V. C T then discharges
through an 8.3mA internal current sink until C T ’s voltage
reaches 1.1V, at which time C T is allowed to charge
through R T again. The oscillator’s period is the sum of
the charge and discharge times of C T . Calculate the
charge time as follows:
t C = 0.57 x R T x C T
where t C is in seconds, R T in ohms ( ? ), and C T in
Farads (F).
The discharge time is then:
t D = (R T x C T x 1000) / [(4.88 x R T ) - (1.8 x 1000)]
where t D is in seconds, R T in ohms ( ? ), and C T in
Farads (F).
______________________________________________________________________________________
13
相关PDF资料 |
PDF描述 |
|---|---|
| MAX16826ATJ+ | IC LED DVR HB PROGR 32TQFN-EP |
| MAX16821CATI+ | IC LED DRIVR HIGH BRIGHT 28-TQFN |
| MAX16821BATI+ | IC LED DRIVR HIGH BRIGHT 28-TQFN |
| LQP03TN3N9C00D | INDUCTOR 3.9NH 170MA 0201 |
| MAX7302AEE+ | IC LED DRIVER LINEAR 16-QSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16807AUI+ | 功能描述:LED照明驱动器 8Ch w/Switch-Mode Boost & SEPIC Ctlr RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX16807AUI+T | 功能描述:LED照明驱动器 8Ch w/Switch-Mode Boost & SEPIC Ctlr RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX16807EVKIT+ | 功能描述:LED 照明开发工具 MAX16807 Eval Kit RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| MAX16808AUI+ | 制造商:Maxim Integrated Products 功能描述:LED DRVR 3V TO 5.5V 28TSSOP EP - Rail/Tube |
| MAX16808AUI+T | 制造商:Maxim Integrated Products 功能描述:LED DRVR 3V TO 5.5V 28TSSOP EP - Tape and Reel |
发布紧急采购，3分钟左右您将得到回复。